diff options
Diffstat (limited to 'net/ipv4/gre.c')
| -rw-r--r-- | net/ipv4/gre.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c index 1cbc46536d1..5ecc9c49b4d 100644 --- a/net/ipv4/gre.c +++ b/net/ipv4/gre.c @@ -93,6 +93,35 @@ void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi, } EXPORT_SYMBOL_GPL(gre_build_header); +struct sk_buff *gre_handle_offloads(struct sk_buff *skb, bool gre_csum) +{ + int err; + + if (likely(!skb->encapsulation)) { + skb_reset_inner_headers(skb); + skb->encapsulation = 1; + } + + if (skb_is_gso(skb)) { + err = skb_unclone(skb, GFP_ATOMIC); + if (unlikely(err)) + goto error; + skb_shinfo(skb)->gso_type |= SKB_GSO_GRE; + return skb; + } else if (skb->ip_summed == CHECKSUM_PARTIAL && gre_csum) { + err = skb_checksum_help(skb); + if (unlikely(err)) + goto error; + } else if (skb->ip_summed != CHECKSUM_PARTIAL) + skb->ip_summed = CHECKSUM_NONE; + + return skb; +error: + kfree_skb(skb); + return ERR_PTR(err); +} +EXPORT_SYMBOL_GPL(gre_handle_offloads); + static __sum16 check_checksum(struct sk_buff *skb) { __sum16 csum = 0; |